You combine like terms so... 13a+12=54. Subtract 2 from both sides and you get 13a=52 . Then divide both sides by 13 and you get 4.. (:
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2a + 11a - 5a = 8a
8a+2b
6b+5a-4b+3a= ? Rearrange it as 5a+3a+6b-4b = 8a+2b
(5a - 4b) + (2c - 3b - 6c) + a =5a - 4b + 2c - 3b - 6c + a =(5a + a) + (-4b - 3b) + (2c - 6c) =[ 6a - 7b - 4c ].
6a-3=8a+11 -3-11=8a-6a -14=2a a=-7